Alert archive / Illinois / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 151, NWS Lincoln, IL

August 3, 2017Champaign County, Piatt County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Aug 3, 2017, 9:30 PM CDT for Champaign County, Piatt County, Illinois. It was in force for 20 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 3, 2017, 9:30 PM CDT (02:30 UTC)
Expired: Aug 3, 2017, 9:50 PM CDT
In force: 20 min
Issued by: NWS Lincoln, IL
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Champaign County, IL, Piatt County, IL

The radar

The Lincoln radar (KILX), 89 km from the middle of the area, began a volume at 02:31 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 2.5 hours before the alert went out and 29 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2243 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1105 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 12.0

Open this sounding in Storm Lab

The text

As transmitted.

160 
WUUS53 KILX 040230
SVRILX
ILC019-147-040300-
/O.NEW.KILX.SV.W.0151.170804T0230Z-170804T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Lincoln IL
930 PM CDT THU AUG 3 2017

The National Weather Service in Lincoln has issued a

* Severe Thunderstorm Warning for...
  Northeastern Piatt County in central Illinois...
  Northern Champaign County in east central Illinois...

* Until 1000 PM CDT

* At 929 PM CDT, a severe thunderstorm was located near Fisher, or 12
  miles west of Rantoul, moving northeast at 55 mph.

  HAZARD...60 mph wind gusts and quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees. 

* Locations impacted include...
  Rantoul, Mahomet, Fisher, Thomasboro, Gifford, Lake Of The Woods,
  Ludlow, Foosland and Dewey.

This includes the following highways...
 Interstate 57 between mile markers 246 and 257.
 Interstate 74 between mile markers 169 and 175.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4015 8841 4028 8852 4028 8846 4035 8846
      4040 8837 4040 8793 4035 8793
TIME...MOT...LOC 0229Z 237DEG 48KT 4028 8839 

HAIL...1.00IN
WIND...60MPH
 
$$

37

1 follow-up statement

454 
WWUS53 KILX 040250
SVSILX

Severe Weather Statement
National Weather Service Lincoln IL
950 PM CDT THU AUG 3 2017

ILC019-147-040259-
/O.CAN.KILX.SV.W.0151.000000T0000Z-170804T0300Z/
Piatt-Champaign-
950 PM CDT THU AUG 3 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PIATT AND
NORTHERN CHAMPAIGN COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning has been cancelled.  However small hail, gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 4015 8841 4028 8852 4028 8846 4035 8846
      4040 8837 4040 8793 4035 8793
TIME...MOT...LOC 0244Z 237DEG 48KT 4043 8808 

$$

37

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 3, 7:30 PM CDT	Special Weather Statement	ILX	Menard	60 min
Aug 3, 8:57 PM CDT	Special Weather Statement	ILX	Champaign	63 min
Aug 3, 9:13 PM CDT	Severe Thunderstorm Warning	ILX	Champaign, Piatt	32 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.